package com.lagou.web.servlet;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SimplePropertyPreFilter;
import com.lagou.base.BaseServlet;
import com.lagou.pojo.Course;
import com.lagou.pojo.Course_Lesson;
import com.lagou.pojo.Course_Section;
import com.lagou.service.CourseContentService;
import com.lagou.service.impl.CourseContentServiceImpl;
import org.apache.commons.beanutils.BeanUtils;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
import java.util.Map;

@WebServlet("/courseContent")
public class CourseContentServlet extends BaseServlet {


    /**
     * 展示对应课程的章节与课时信息
     * */
    public void findSectionAndLessonByCourseId(HttpServletRequest request ,
                                               HttpServletResponse response){
        try {
//1.获取参数
            String course_id = request.getParameter("course_id");
//2.业务处理
            CourseContentService contentService = new
                    CourseContentServiceImpl();
            List<Course_Section> sectionList =
                    contentService.findSectionAndLessonByCourseId(Integer.parseInt(course_id));
//3.返回结果
            String result = JSON.toJSONString(sectionList);
            response.getWriter().println(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //回显章节对应的课程信息
    public void findCourseById(HttpServletRequest request , HttpServletResponse
            response){
        try {
//1.获取参数
            String courseId = request.getParameter("course_id");
//2.业务处理
            CourseContentService contentService = new
                    CourseContentServiceImpl();
            Course course =
                    contentService.findCourseByCourseId(Integer.parseInt(courseId));
//3.返回数据,将对象转换为JSON,只转换需要的字段
            SimplePropertyPreFilter filter = new
                    SimplePropertyPreFilter(Course.class,"id","course_name");
            String result = JSON.toJSONString(course,filter);
            response.getWriter().println(result);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 保存&修改 章节信息
     * */
    public void saveOrUpdateSection(HttpServletRequest request
            ,HttpServletResponse response){
        try {
//1.获取参数 从域对象中获取
            Map<String,Object> map = (Map)request.getAttribute("map");
//2.创建Course_Section
            Course_Section section = new Course_Section();
//3.使用BeanUtils工具类,将map中的数据封装到 section
            BeanUtils.populate(section,map);
//4.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();

            if(section.getId() != 0){
//修改操作
                String result = contentService.updateSection(section);
//5.返回结果数据
                response.getWriter().println(result);
            }else{
//添加操作
                String result = contentService.saveSection(section);
//5.返回结果数据
                response.getWriter().println(result);
            }


        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 修改章节状态
     * */
    public void updateSectionStatus(HttpServletRequest request ,
                                    HttpServletResponse response){
        try {
//1.获取参数
            int id = Integer.parseInt(request.getParameter("id"));
            int status = Integer.parseInt(request.getParameter("status"));
//4.业务处理
            CourseContentService contentService = new
                    CourseContentServiceImpl();
            String result = contentService.updateSectionStatus(id, status);
//5.返回结果数据findSectionById
            response.getWriter().println(result);
        } catch (Exception e) {
            e.printStackTrace();
        }


}


    /**
     * 保存&修改 课时信息
     * */
    public void saveOrUpdateLesson(HttpServletRequest request
            ,HttpServletResponse response){
        try {
//1.获取参数 从域对象中获取
            Map<String,Object> map = (Map)request.getAttribute("map");
//2.创建Course_Lesson
            Course_Lesson lesson = new Course_Lesson();
//3.使用BeanUtils工具类,将map中的数据封装到 section
            BeanUtils.populate(lesson,map);
//4.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();

            if(lesson.getId() != 0){
//修改操作
                String result = contentService.updateLesson(lesson);

//5.返回结果数据
                response.getWriter().println(result);
            }else{
//添加操作
                String result = contentService.saveLesson(lesson);
//5.返回结果数据
                response.getWriter().println(result);
            }


        } catch (Exception e) {
            e.printStackTrace();
        }
    }


}

